Boiler-furnace.



T. D. CASSERLY.

BOILER FUENACE.

APPUcATlon FILED DEC.14.1917.

Patented Aug. 20, 1918 2 SHEETS-SHEET l.

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T. D. CASSERLY.

BiOILER FURNACE.

APPucATmNme nec. 14.1911.

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NETE@ PATE-N@ THOl/IAS D. CASSERLY, GF CEICAGO, ILLINOS, ASSIGNOR TO ABRAM COX. STOVE COM- PANY, 0F PHILADELPHIA, PENNSYLVANIA, A CORPORATIQN OF PENNSYLVANIA.

BOILER-FURNACE.

Application ledDecember 14, 1917.

To all whom t may concern.'

Be it known that I, THOMAS D. CassnRLY, a citizen of the United States, and a resident of Chicago, county of Cook, State of illinois, have invented certain Improvements in Boiler-Furnaces, of which the following is a speciication.

My invention relates to certain improvements in boilers used for heating buildings, either with hot water or steam, and the invention relates particularly to boilers consisting of cast iron sections having portions extending over the hre.

One object of my invention is to construct a boiler of this type so that the products of combustion will be thoroughly consumed before entering the chimney. This object l attain by forming an overhead brick arch at the back of the tire box so that the major portion of the products of combustion m'ust pass under the arch prior to circulating through the flue spaces of the boiler.

A further obj ect of the invention is to provide gas passages between the upper por` tion of the arch and the overhanging portion of the boiler.

lthese objects l attain in the following manner, reference being had to the accompanying drawings, in which:

Figure 1 is a longitudinal sectional view of a boiler, illustrating my invention;

Fig. 2 is a transverse sectional view; and

Fig. 8 is a perspective view of the form of arch illustrated in Figs. 1 and 2.

1 is the base of the furnace. 2 is the grate. 3 are the intermediate cast boiler sections. Ll are the end sections of the boiler. These sections are made hollow an d communicate with one another so as to allow the water to circulate freelv through all of the sections. Each of the intermediate sections has depending legs 5 at the rear and-the side sections eXtend down to a point in line with the legs and form, with the intermediate sections, the walls of the lire chamber. The abutting ends of the several sections are recessed so that when assembled they form fines 6 and 7. The lower flue 6 communicates through a passage 8 with the combustion chamber and at its outer end with the upper liue 7 through a passage 9. The upper flue 7 connects with the down flue 10 formed in the baci; plate of the boiler which, in turn, communicates with the pipe leading Specification of Letters latent.

atented Aug, 2Q, 1918.

serial no. 207,150.

to the chimney. This construction, as above described, is a type of boiler that was made prior to my invention.

ln order to thoroughly consume the prod` ucts of combustion in this type of boiler, I form a transverse arch ll, preferably of lire brick, or other suitable non-combustible ma` terial, which is located a given distance from the back of the combustion chamber so as to form a comparatively narrow flue l2. This arch is vertically arranged and extends into the space lll formed by the tongues 15, which project from theoverhanging portions of the boiler sections. The upper edge of the arch stops shortof the top of the space so as to form gas passages 16, and the arch is reduced at its upper edge so as to pass between two of the laterally projecting portions 17 of the tongues. The arch, in the present instance, is built in the furnace in any suitable manner, preferably by making the fire brick sections and cementing them together. rlhe arch is held by studs 18 projecting into the arch from the side sections of the boiler, as clearly shown in Fig. 2, but it will be understood that other means of fastening the arch and its sections may be resorted to without departing from the essential feature ofthe invention.

The arch is comparatively narrow so as to provide a large, unobstructed combustion chamber, and is of such a length that its lower edge preferably extends into the body of coal on the grate. yEhe fire brick arch forms, in fact, the back of the main lire chamber and when the fire chamber is charged with coal the flow is down under the arch, as shown in the drawings, the bed of coal being shallower at the back than at the front and the products of combustion, as theyarise from the main body of coal, must pass through the body of coal at the rear and under the arch so that the rear portion of the furnace is practically a down draft furnace, as there is not suHicient area in the gas passages 16 above the arch to carry off the major portion of the products of combustion, consequently, the tire brick arch becomes very highly heated and aids in the thorough combustion of the fuel and as the body of coal beyond the arch is comparatively shallow, as shown in the drawings, a certain amount of heated air passes up through the grate and through the shallow body of coal iet/afina troni the ash pit and combines With the products ot combustion passing under the arch. Therefore, the products ogt combustion are thoroughl'x,T consumed they7 pass up the rear flue l2 and through the two horizontal fines 6 and I to the chimney due.

By providing the gas passages 16 above the arch, the Which would naturall)Y accumulate in the upper portion ot the coinbustion chamber freely escapes over the arch and combines with the products of coinbustier in the vertical flue l2 and also thoroughhr consumed in its passage through the horizontal tiues.

its before rein.=rled, the transverse arch ll ina);T be built up in the furnace or niay be inade in sections and secured in position in any suitable inanner and, in soine instances, niay be inade hollow and reinforced, it found desirable. any suitable ineans nia) be provided for admitting air troni the ash pit to the rear tine bach of the tire brick arch, but. if the bed of hre at this point is shallow, as shown in the drawings, suhi cient air will be passed through the shallow bodilv of fuel to aroperly consunie the products of combustion.

lWhile have shown a particular :torni ot boiler haring an overhanging portion with depending tongues directlyr over the lire, nir intention can he applied to other types of Water or steani boilers Which are formed bjc assembling cast nietal sections. he niain feature of the intention is the forming ot a transverse suspended arch at the rear ot the combustion ehainber so as to 'torni a bach flue which causes the products ot' combustion to pass under the arch and through a portion of the Jnel to the grate.

.l claiin:

l. rlhe oon-il inat-ion in a sectional boiler, of a grate; a series oiu intermediate sectie is and end sections, the intermediate sections extending` over the grate and haring depending legs at the back, said seetione haring horizontal fines ior the passage of the products oi' combustion in that portion :Attending over the grate; a separate transverse arch located in the combusti on chamber under the orerhanging portions of the boiler and ein tending to point directliv above the grate and spaced troni the rear oif the boiler formed by the dependin leo-s to forro a ver- Genies of this 'patent tical flue which communicates with the hori Zontal flue.

Q. The combination in a sectional boiler, ot a grate; a series ot intermediate .sections and end sections, the intermediate sectione` extending over the combustion chamber and haring iues therein and also haring'. tongues less in Width than the sections and extending toward the grate; and an independent lire briclarch arranged transversely across the combustion chainber at a point sonie distance roni the bach of said chainber so to Jorin a Yvertical due between the bach ot the combustion chamber and the arch, said flue connnnnicating with the tlues inthe boiler sections, said arch heatingportions projecting into the spaces between the tongues and terminating` short et the sections et' the boiler so as to torni narrouv gas passages bet-Ween the upper end oit the extending portions of the arch of the boiler,

said arch being4 of such depth that, under nornial conditions, it Will extend into the upper surface of the fuel so that the products of combustion niust pass under the arch and through a portion ot the fuel into the rear flue.

f3. rlie combination in a sectional boiler, of a hase; a grate; a series of intermediate sections and end sections forming the boiler; longitudinal dues .tornied between the sereral sections, each of the intermediate se tions haring` depending' tongues less in Width than the sections, each of the tongues haring projecting portions .spaced apart, each section also haring legs, and the end sections extending* doirn to a point on a line with the and forming, with the legs, coinbustion chamber` the lower fines in. the overhead portion coinniunicatino, with the combustion chainber at the rear; and a transverse lire briclr arch extending across the combustion chamber above the grate and at distance from the bach oit the combustion chamber to forni a Vertical flue communicating' with the said lower iiue or the overhead portion ot the boiler, said arch being1 notched to receive the tongues of the overhead sections of the boiler, the portion between the notches being reduced in Width.; and incans tor securing` the arch to the side sections of the boiler.

ln Witness uhereoi2 l iny" signature.

THC-MS D. CSSERLY.

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